- Garage Doors & Door Operating Devices, Caledon
- Garage Doors & Gates, Caledon - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Caledon
- Garbage & Rubbish Removal, Caledon
- Gas Piping Contractors, Caledon - Gas Pipe Installation & Repair Service
- Gas Station, Caledon - Service & Filling Station
- General Business Services, Caledon
- General Management Consulting Services, Caledon - Management Consultants
- General Merchandise Stores, Caledon
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- General Travel Agents & Agencies, Caledon
- Generators, Compressors, Pumps, Motors & Fans, Caledon
- Glass, Plastic & Rubber Working Machinery, Caledon
- Golf Clubs Private, Caledon
- Golf Courses, Caledon
- Government, Caledon
- Grocery Stores & Supermarkets, Caledon
- Ground Transportation, Except Passenger, Caledon
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